1
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Briavioids E-G, Newly Isolated Briarane-Diterpenoids from a Cultured Octocoral Briareum violaceum. Mar Drugs 2023; 21:md21020124. [PMID: 36827165 PMCID: PMC9959093 DOI: 10.3390/md21020124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 02/13/2023] [Accepted: 02/13/2023] [Indexed: 02/17/2023] Open
Abstract
The chemical screening of a cultured soft coral, Briareum violaceum, led to the isolation of eight natural, briarane-related diterpenoids, including three unreported metabolites, briavioids E-G (1-3), and five known briaranes, briacavatolides B (4) and C (5), briaexcavatin L (6), briaexcavatolide U (7) and briarenol K (8). The structures of briaranes 1-8 were established using spectroscopic methods. The absolute configuration of briavioid A (9), obtained in a previous study, was reported for the first time in this study by a single-crystal X-ray diffraction analysis using a copper radiation source. The anti-inflammatory activity of briaranes 1 and 2 and briaranes 4-8 was evaluated by screening their inhibitory ability against the expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) proteins in lipopolysaccharide (LPS)-induced RAW 264.7 macrophage cells.
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2
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Briastecholide M, a New Polyoxygenated Briarane from Briareum stechei. Chem Pharm Bull (Tokyo) 2023; 71:183-187. [PMID: 36724981 DOI: 10.1248/cpb.c22-00605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A formerly unpublicized briarane diterpenoid, briastecholide M (1), and its established analogue, brianodin B (2), were purified from Briareum stechei, an octocoral collected from Okinawan waters. Using spectroscopic methods, the structure of 1 was established. Functional study showed that 1 can reducing the release of inducible nitric oxide synthase (iNOS) but enhancing cyclooxygenase-2 (COX-2) protein expression.
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3
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Briarane-Related Diterpenoids from Octocoral Briareum stechei. Molecules 2021; 26:molecules26226861. [PMID: 34833953 PMCID: PMC8619598 DOI: 10.3390/molecules26226861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 11/09/2021] [Accepted: 11/11/2021] [Indexed: 11/17/2022] Open
Abstract
A known polyoxygenated briarane, briaexcavatolide P (1), was isolated from a Formosan octocoral Briareum stechei. Moreover, the same species B. stechei, collected from Okinawan waters, yielded three chlorine-containing briaranes, including two new compounds, briastecholides B (2) and C (3) as well as a known analogue, briarenol R (4). The structures of 1-4 were established using spectroscopic methods. In addition, briarane 1 demonstrated anti-inflammatory activity in lipo-polysaccharide-induced RAW 264.7 mouse macrophage cells by suppressing the expression of inducible nitric oxide synthase (iNOS) protein.
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4
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8-Hydroxy briaranes from Octocoral Briareum stechei (Briareidae) (Kükenthal, 1908). Mar Drugs 2021; 19:md19030136. [PMID: 33671058 PMCID: PMC7998228 DOI: 10.3390/md19030136] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 02/25/2021] [Accepted: 02/26/2021] [Indexed: 11/22/2022] Open
Abstract
Chemical investigation of the octocoral Briareum stechei, collected in the Ie Island, Okinawa, Japan, resulted in the isolation of a new briarane-type diterpenoid, briastecholide A (1), as well as the previously reported metabolites, solenolide C (2) and briarenolide S (3). The structures of briaranes 1–3 were characterized through spectroscopic analysis, and the absolute configuration of 2 was corroborated by a single-crystal X-ray diffraction analysis. Briarane 3 exhibited bioactivity against the protein expression of inducible nitric oxide synthase (iNOS).
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5
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Briarenols W-Z: Chlorine-Containing Polyoxygenated Briaranes from Octocoral Briareum stechei (Kükenthal, 1908). Mar Drugs 2021; 19:md19020077. [PMID: 33572535 PMCID: PMC7911717 DOI: 10.3390/md19020077] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 01/19/2021] [Accepted: 01/28/2021] [Indexed: 12/18/2022] Open
Abstract
Briareum stechei is proven to be a rich source of 3,8-cyclized cembranoids (briarane) with a bicyclo[8.4.0] carbon core. In the present study, four previously unreported briaranes, briarenols W–Z (1–4), along with solenolide A (5), briarenolide M (6), briaexcavatolide F (7), and brianolide (8), were isolated and characterized through spectroscopic analysis, and the absolute configuration of 8 was corroborated by a single-crystal x-ray diffraction analysis. Briaranes 2 and 5 were found to induce significant inflammatory activity in lipopolysaccharide (LPS)-induced RAW 264.7 mouse macrophage cells by enhancing the expression of the inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) proteins.
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6
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Briarenols Q-T: Briaranes from A Cultured Octocoral Briareum stechei (Kükenthal, 1908). Mar Drugs 2020; 18:md18080383. [PMID: 32722176 PMCID: PMC7460508 DOI: 10.3390/md18080383] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 07/17/2020] [Accepted: 07/20/2020] [Indexed: 02/02/2023] Open
Abstract
Our continuous chemical study of a cultured octocoral Briareum stechei led to the isolation of four new briarane diterpenoids, briarenols Q-T (1-4). The structures of new metabolites 1-4 were established by spectroscopic methods, and compounds 3 and 4 were found to inhibit the generation of inducible nitric oxide synthase (iNOS) from RAW 264.7 stimulated by lipopolysaccharides (LPS).
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7
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11β,20β-Epoxy briaranes from the Gorgonian Coral Junceella fragilis (Ellisellidae). Mar Drugs 2020; 18:md18040183. [PMID: 32244363 PMCID: PMC7231240 DOI: 10.3390/md18040183] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 03/28/2020] [Accepted: 03/30/2020] [Indexed: 11/28/2022] Open
Abstract
Two 11,20-epoxybriaranes, including a known compound, juncenolide K (1), as well as a new metabolite, fragilide X (2), have been isolated from gorgonian Junceella fragilis collected off the waters of Taiwan. The absolute configuration of juncenolide K (1) was determined by single-crystal X-ray diffraction analysis for the first time in this study and the structure, including the absolute configuration of briarane 2 was established on the basis of spectroscopic analysis and compared with that of model compound 1. One aspect of the stereochemistry of the known compound 1 was revised. Briarane 2 was found to enhance the generation of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) release from RAW 264.7 cells.
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8
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Briarenols I-K, New Anti-inflammatory 8,17-Epoxy briaranes from the Octocoral Briareum excavatum (Briareidae). Molecules 2020; 25:molecules25061405. [PMID: 32204524 PMCID: PMC7144368 DOI: 10.3390/molecules25061405] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 03/14/2020] [Accepted: 03/16/2020] [Indexed: 11/24/2022] Open
Abstract
Five 8,17-epoxybriaranes, including three new compounds—briarenols I–K (1–3), along with two known analogues, briaexcavatolide P (4) and briaexcavatin P (5), were isolated from the octocoral Briareum excavatum. The structures of briaranes 1–3 were elucidated by spectroscopic methods, including 1D and 2D NMR studies and (+)-HRESIMS. Briarane 4 exerted inhibition effects on inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) release from RAW 264.7.
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9
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Fragilides U-W: New 11,20-Epoxy briaranes from the Sea Whip Gorgonian Coral Junceella fragilis. Mar Drugs 2019; 17:md17120706. [PMID: 31847481 PMCID: PMC6950706 DOI: 10.3390/md17120706] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 12/17/2022] Open
Abstract
Three new 11,20-epoxybriaranes—fragilides U–W (1–3), as well as two known metabolites, junceellonoid D (4) and junceellin (5), were obtained from the octocoral Junceella fragilis. The structures of briaranes 1–3 were elucidated by spectroscopic methods and briaranes 3 and 5 displayed inhibition effects on inducible nitric oxide synthase (iNOS) release from RAW264.7.
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10
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New 8-Hydroxy briaranes from the Gorgonian Coral Junceella fragilis (Ellisellidae). Mar Drugs 2019; 17:md17090534. [PMID: 31540107 PMCID: PMC6780648 DOI: 10.3390/md17090534] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/10/2019] [Accepted: 09/10/2019] [Indexed: 01/16/2023] Open
Abstract
Three new 8-hydroxybriaranes—fragilides R–T (1–3) were obtained from a sea whip gorgonian coral Junceella fragilis. The structures of briaranes 1–3 were elucidated by using spectroscopic methods, including 1D (1H and 13C NMR), 2D (COSY, HSQC, HMBC, and NOESY experiments) NMR studies, and (+)-HRESIMS. Fragilides S and T (2 and 3) are the only briaranes known to possess 8α-hydroxy and 17β-methyl groups, respectively. Briarane 2 exerted an inhibition effect on iNOS release from RAW264.7; a macrophage cell line that originated from a mouse monocyte macrophage, stimulated with lipopolysaccharides.
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11
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New 11,20-Epoxy briaranes from the Gorgonian Coral Junceella fragilis (Ellisellidae). Molecules 2019; 24:molecules24132487. [PMID: 31284657 PMCID: PMC6659381 DOI: 10.3390/molecules24132487] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 06/29/2019] [Accepted: 07/05/2019] [Indexed: 12/04/2022] Open
Abstract
Two new 11,20-epoxybriaranes, fragilides P (1) and Q (2), as well as two known analogues, robustolide F (3) and juncin Z (4), were obtained from the gorgonian coral Junceella fragilis. The structures, including the absolute configurations of briaranes 1 and 2, were elucidated by using spectroscopic methods and comparing the spectroscopic and rotation data with those of known related analogues. Briarane 4 decreased the generation of superoxide anions by human neutrophils. The propionate group in 1 is rarely found.
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12
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Natural Product Chemistry of Gorgonian Corals of Genus Junceella⁻Part III. Mar Drugs 2018; 16:md16090339. [PMID: 30227646 PMCID: PMC6165226 DOI: 10.3390/md16090339] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 09/10/2018] [Accepted: 09/15/2018] [Indexed: 12/26/2022] Open
Abstract
The structures, names, bioactivities, and references of 82 natural products, including 48 new metabolites, purified from the gorgonian corals belonging to the genus Junceella are described in this review. All compounds mentioned in this review were obtained from Junceella fragilis, Junceella gemmacea, Junceella juncea, and Junceella sp., collected from tropical Indo-Pacific Ocean. Some of these compounds exhibited potential biomedical activities.
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13
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Fragilides K and L, New Briaranes from the Gorgonian Coral Junceella fragilis. Molecules 2018; 23:molecules23071510. [PMID: 29932137 PMCID: PMC6100390 DOI: 10.3390/molecules23071510] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 06/18/2018] [Accepted: 06/19/2018] [Indexed: 12/22/2022] Open
Abstract
Two new briarane metabolites—fragilides K (1) and L (2)—along with five known analogues—gemmacolide X, praelolide, juncins P and ZI, and gemmacolide V (3–7)—were extracted and purified from Junceella fragilis, a gorgonian coral. Based on data obtained via spectroscopic techniques, the structures of new briaranes 1 and 2 were determined and the cyclohexane rings in 1 and 2 were found to exist in chair and twist boat conformation, respectively. Additionally, anti-inflammatory analysis showed that briaranes 2, 3, and 6 inhibited pro-inflammatory inducible nitric oxide synthase protein expression and briaranes 3 and 7 suppressed the cyclooxygenase-2 level, in LPS-stimulated murine macrophage-like RAW264.7 cells.
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14
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Briaviolides K-N, New Briarane-Type Diterpenoids from Cultured Octocoral Briareum violaceum. Mar Drugs 2018; 16:E75. [PMID: 29495481 PMCID: PMC5867619 DOI: 10.3390/md16030075] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 02/01/2018] [Accepted: 02/23/2018] [Indexed: 01/07/2023] Open
Abstract
Four new briarane diterpenoids, briaviolides K-N (1-4), have been obtained from the cultured-type octocoral Briareum violaceum. Using a spectroscopic approach, the structures of briaranes 1-4 were identified. This study employed an in vitro model of lipopolysaccharide (LPS)-induced inflammation in the murine macrophage RAW 264.7 cell line, and found that among the four briaranes, briarane 2 possessed anti-inflammatory activity against inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) protein expressions in cells. In addition, principal component analysis using the chemical global positioning system (ChemGPS) for natural products (ChemGPS-NP) was employed in order to analyze the structure-activity relationship (SAR), and the results indicated that the ring conformation of the compound has a leading role in suppressing the expressions of pro-inflammatory iNOS and COX-2 proteins in macrophages.
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15
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Terpenoids from Octocorals of the Genus Pachyclavularia. Mar Drugs 2017; 15:md15120382. [PMID: 29206207 PMCID: PMC5742842 DOI: 10.3390/md15120382] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 12/01/2017] [Accepted: 12/04/2017] [Indexed: 01/18/2023] Open
Abstract
In this paper, we reviewed natural compounds isolated from octocorals belonging to the genus Pachyclavularia, including 20 cembrane-, 39 briarane-, and eight briarellin-related diterpenoids, and one secosterol. The chemical constituents of these 68 secondary metabolites, and their names, structures, and bioactivities, along with studies of their biological activities, are summarized in this review. Based on the literature, many of these compounds possess bioactivities, including anti-inflammation properties, cytotoxicity, and ichthyotoxicity, suggesting that they may have the potential to be developed into biomedical agents for treatment.
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16
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Briarenols C-E, New Polyoxygenated Briaranes from the Octocoral Briareum excavatum. Molecules 2017; 22:molecules22030475. [PMID: 28304345 PMCID: PMC6155408 DOI: 10.3390/molecules22030475] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 03/10/2017] [Accepted: 03/15/2017] [Indexed: 12/31/2022] Open
Abstract
Three new polyoxygenated briarane diterpenoids, briarenols C–E (1–3), were isolated from the octocoral Briareum excavatum. The structures of briaranes 1–3 were elucidated by interpretation of spectroscopic data, and the methylenecyclohexane ring in 1 was found to exist in a twisted boat conformation. Briarenol D (2) displayed an inhibitory effect on the release of elastase by human neutrophils with an IC50 value of 4.65 μM. Briarenol E (3) was found to inhibit the protein expression of pro-inflammatory inducible nitric oxide synthase (iNOS) in a murine macrophage-like cell line, RAW 264.7, stimulated with lipopolysaccharides (LPS).
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17
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Briarane Diterpenoids Isolated from Octocorals between 2014 and 2016. Mar Drugs 2017; 15:md15020044. [PMID: 28218675 PMCID: PMC5334624 DOI: 10.3390/md15020044] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 02/14/2017] [Accepted: 02/15/2017] [Indexed: 12/29/2022] Open
Abstract
The structures, names, bioactivities, and references of 124 briarane-type natural products, including 66 new metabolites, isolated between 2014 and 2016 are summarized in this review article. All of the briarane diterpenoids mentioned in this review were isolated from octocorals, mainly from Briareum violacea, Dichotella gemmacea, Ellisella dollfusi, Junceella fragilis, Junceella gemmacea, and Pennatula aculeata. Some of these compounds exhibited potential biomedical activities, including anti-inflammatory activity, antibacterial activity, and cytotoxicity towards cancer cells.
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18
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New 9-Hydroxy briarane Diterpenoids from a Gorgonian Coral Briareum sp. (Briareidae). Int J Mol Sci 2016; 17:ijms17010079. [PMID: 26761004 PMCID: PMC4730323 DOI: 10.3390/ijms17010079] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 12/30/2015] [Accepted: 01/05/2016] [Indexed: 01/05/2023] Open
Abstract
Six new 9-hydroxybriarane diterpenoids, briarenolides ZI-ZVI (1-6), were isolated from a gorgonian coral Briareum sp. The structures of briaranes 1-6 were elucidated by spectroscopic methods and by comparison of their spectroscopic data with those of related analogues. Briarenolides ZII (2) and ZVI (6) were found to significantly inhibit the expression of the pro-inflammatory inducible nitric oxide synthase (iNOS) protein of lipopolysaccharide (LPS)-stimulated RAW264.7 macrophage cells.
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19
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Briarenolides U-Y, New Anti-Inflammatory Briarane Diterpenoids from an Octocoral Briareum sp. (Briareidae). Mar Drugs 2015; 13:7138-49. [PMID: 26633428 PMCID: PMC4699233 DOI: 10.3390/md13127060] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Revised: 11/20/2015] [Accepted: 11/25/2015] [Indexed: 01/14/2023] Open
Abstract
Five new 13,14-epoxybriarane diterpenoids, briarenolides U–Y (1–5), were isolated from the octocoral Briareum sp. The structures of briaranes 1–5 were elucidated by spectroscopic methods. Briarenolides U–Y (1–5) were found to significantly inhibit the expression of the pro-inflammatory inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) protein of the lipopolysaccharide (LPS)-stimulated RAW264.7 macrophage cells.
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20
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Briarenolides K and L, new anti-inflammatory briarane diterpenoids from an octocoral Briareum sp. (Briareidae). Mar Drugs 2015; 13:1037-50. [PMID: 25689566 PMCID: PMC4344617 DOI: 10.3390/md13021037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 02/05/2015] [Accepted: 02/06/2015] [Indexed: 01/03/2023] Open
Abstract
Two new briarane-type diterpenoids, briarenolides K (1) and L (2), were isolated from an octocoral identified as Briareum sp. The structures of new briaranes 1 and 2 were elucidated by spectroscopic methods. In the in vitro anti-inflammatory effects test, briaranes 1 and 2 were found to significantly inhibit the accumulation of the pro-inflammatory iNOS protein of the lipopolysaccharide (LPS)-stimulated RAW264.7 macrophage cells.
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21
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Briareolate esters from the gorgonian Briareum asbestinum. Mar Drugs 2012; 10:1662-1670. [PMID: 23015768 PMCID: PMC3447333 DOI: 10.3390/md10081662] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Revised: 07/25/2012] [Accepted: 07/30/2012] [Indexed: 11/17/2022] Open
Abstract
Two new briarane diterpenoids briareolate esters J (1) and K (2) were isolated from the methanolic extract of the octocoral Briareum asbestinum collected off the coast of Boca Raton, Florida. The structures of briaranes 1 and 2 were elucidated by interpretation of spectroscopic data. Briareolate ester K (2) showed weak growth inhibition activity against human embryonic stem cells (BG02).
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22
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Briarenolides F and G, new briarane diterpenoids from a Briareum sp. octocoral. Mar Drugs 2012; 10:1156-1168. [PMID: 22822363 PMCID: PMC3397458 DOI: 10.3390/md10051156] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Revised: 05/15/2012] [Accepted: 05/22/2012] [Indexed: 11/16/2022] Open
Abstract
Two new briarane diterpenoids, briarenolides, F (1) and G (2), were isolated from an octocoral identified as Briareum sp. The structures of briaranes 1 and 2 were established by spectroscopic methods and by comparison of the spectroscopic data with those of known briarane analogues. Briarenolide F was proven to be the first 6-hydroperoxybriarane derivative and this compound displayed a significant inhibitory effect on the generation of superoxide anion by human neutrophils.
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23
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Natural product chemistry of gorgonian corals of genus Junceella--part II. Mar Drugs 2011; 9:2773-2792. [PMID: 22363249 PMCID: PMC3280581 DOI: 10.3390/md9122773] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 12/06/2011] [Accepted: 12/15/2011] [Indexed: 11/29/2022] Open
Abstract
The structures, names, bioactivities, and references of 81 new secondary metabolites obtained from gorgonian corals belonging to the genus Junceella are described in this review. All compounds mentioned in this review were obtained from sea whip gorgonian corals Junceella fragilis and Junceella juncea, collected from the tropical and subtropical Indo-Pacific Ocean.
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24
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Excavatoids O and P, new 12-hydroxy briaranes from the octocoral Briareum excavatum. Mar Drugs 2010; 8:2639-46. [PMID: 21116411 PMCID: PMC2992997 DOI: 10.3390/md8102639] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Revised: 09/23/2010] [Accepted: 10/09/2010] [Indexed: 11/21/2022] Open
Abstract
Two new 12-hydroxybriarane diterpenoids, designated as excavatoids O (1) and P (2), were isolated from the octocoral Briareum excavatum. The structures of briaranes 1 and 2 were established on the basis of extensive spectral data analysis. Excavatoid P (2) is the first metabolite which possesses a 6β -chlorine atom in briarane analogues.
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25
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Excavatoids E and F: discovery of two new briaranes from the cultured octocoral Briareum excavatum. Mar Drugs 2009; 7:472-82. [PMID: 19841727 PMCID: PMC2763113 DOI: 10.3390/md7030472] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2009] [Revised: 09/19/2009] [Accepted: 09/23/2009] [Indexed: 11/17/2022] Open
Abstract
Two new briarane-related diterpenoids, designated as excavatoids E (1) and F (2), were isolated from the cultured octocoral Briareum excavatum. The structures of compounds 1 and 2 were established on the basis of extensive spectral data analysis. Briaranes 1 and 2 were found to exhibit moderate inhibitory effects on elastase release by human neutrophils.
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